Wiper and Washer Systems: Application and ID

Windscreen wiper

Introduction

General instructions/safety instructions

DANGER:
Danger of injury when wiper motor starts.
Danger of injury to hands and fingers when working on wiper mechanism with engine running.
- Make sure to switch ignition off and disconnect the power supply to the wiper motor.

DANGER:
Risk of damage to paintwork on bonnet and wiper arms.
- The wiper arms may touch the bonnet it bonnet is open and wiper motor is running.
- Do not open bonnet/engine compartment lid when wiper arms are raised - damage to paintwork and mechanism.

NOTE: When bonnet lock is unlocked, the wiper motor is switched off or remains in parking position and cannot be switched on. This applies only for speeds of less than 5 km/h; the wiper can be actuated again in higher speeds for safety reasons.

DANGER:
Danger of damage due to improper handling of batteries and control module plug connections.
- Never disconnect battery with engine running.
- Never start engine if battery terminal clamps are not connected securely.
- Never pull off or push on plug connections for the control modules or other electronic components when the ignition is switched on.
- Always disconnect the negative terminal of the battery and pull off all plug connections to the vehicle electrical system control module when carrying out welding work on the vehicle.

Troubleshooting procedure
Specific troubleshooting can only be performed in accordance with instructions (given under Diagnosis/troubleshooting for each fault code) if the entry has the status 'present' in the fault memory.

If the fault is currently 'not present', please check the following:
- Diagnostic conditions are met
- All plug connections and ground points of the affected current path are OK
- Set all wiring harnesses of the affected current path to a state that corresponds to driving by pulling and shaking them.

Diagnostic conditions

NOTE:
Important: Always connect a suitable battery charging device to the vehicle electrical system battery before starting diagnosis. All unnecessary loads must also be switched off.

NOTE: The fault can only be identified if the requirements listed under 'Diagnostic conditions' are met For this reason, the specified procedure must be observed after a fault is repaired:

1. Erase fault memory
2. Satisfy the requirements listed under 'Diagnostic conditions'.
3. Read out fault memory again.

Possible causes of fault

NOTE: The 'possible causes of fault' that are responsible for the fault are listed here. Please note that in certain circumstances further faults can be stored in the fault memory after troubleshooting (e.g. if plugs are disconnected). After carrying out repairs, read out the fault memory of all control modules and erase any faults.

Diagnosis/troubleshooting

NOTE: The fault memory Info key [F8] on the Porsche System Tester II No.9588 can be used to access the 'extended fault memory'. The following information can be displayed:

Fault type
The following fault types are possible:
- No display
- Upper limit value exceeded
- Lower limit value not reached
- Mechanical fault
- No signal/communication
- No or incorrect basic setting/adaptation
- Short circuit to B+
- Short circuit to ground
- Implausible signal
- Open circuit/short circuit to ground
- Open circuit/short circuit to B+
- Open circuit
- Electrical fault in electric circuit
- Please read out fault memory
- Faulty
- Cannot be checked now

Fault status
The following status types are possible:
- present
- not present

This information should be saved using the Save key [F4] and printed out.